Model #: 2000001936
Press the MODE button until "TIME" mode is displayed.
Hold down the CLK button for about three seconds.
12/24 hour time mode is displayed.
Press SEL to change the value.
Press either the center diamond button, or the CLK button to move to the next value to change.
Press the MODE button until "COMP" (compass) mode is displayed.
Press and hold the ALM button for about three seconds.
The display will show "CAL" mode.
Hold the compass flat in your hand, face up.
Press the SEL button to begin calibration.
From the manual: "Turn the unit clockwise in two circles on a level surface where it is free from unnecessary metal plate, home appliance, computer and high power cable, etc. The circles do not need to be perfect circles, but must be completed in the same direction. It is also important that each circle takes a minimum of 20 seconds but less than 1 minute to complete."
Press the ALM button to complete the calibration.
Press the MODE button until "COMP" (compass) mode is displayed.
Press and hold the ALM button for about three seconds.
The display will show "CAL" mode.
Press the ALM button to enter "dEC" mode.
Use the SEL button to adjust each value and the ALM button to move between values.
Don't forget to set the final value from "off" to "on" or else declination will not be used.
Press the MODE button until "SW" (stopwatch) mode is displayed.
Press ALM to start/stop the stopwatch.
While the stopwatch is running, SEL is the lap button.
While the stopwatch is stopped, hold down SEL to clear the stopwatch.
The CLK and diamond buttons switch between "LA" (lap) display and "SP" (split?) display.
While in "TIME" mode, press the SEL button to see min/max temperature. To reset the min/max, press (and release) SEL to display min/max temp, then hold down the SEL button for about three seconds.
Go to TIME mode.
Press the ALM button to switch the display from day/month mode to alarm mode.
Press and hold the ALM button for about three seconds to enter alarm set mode.
Use the SEL button to change values, and the ALM button to move to the next value to set.
There's no way to turn it off, but it should use less power in clock mode. You could also pull the battery. Regardless, I've had one sitting around for years, and the battery's fine.